1976 Mercedes-Benz 450 SL for Repair or Parts. "Please read description"

1976 Mercedes-Benz SL-Class 450 SL

Condition: Used
Make: Mercedes-Benz
Model: SL-Class
Type: Convertible
Trim: 450 SL
Year: 1976
Mileage: 63,000
VIN: 107 044 12 028396
Color: Grey Blue
Engine: V8
Cylinders: 8
Fuel: Gasoline
Transmission: Automatic
Drive type: RWD
Interior color: Blue
Vehicle Title: Clear
Item location: Madison, Wisconsin, United States
Extras
Cruise Control
Convertible
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Description for Mercedes-Benz SL-Class 1976

I'm selling my 1976 Mercedes 450 SL for Parts or Repair, the odometer on the car shows less than 63,000 miles but I can't confirm that it is the real mileage. The car starts but will not staying running and doesn't seem to change gear while moving.
The 450SL should have a 4.5l V8 with the engine number 117.985, instead MINE HAS A 6.9L V8 WITH THE ENGINE NUMBER 100.985
The car has a crack on the windshield, and on the dashboard.
The body has some spot rust, see pictures
The interior needs upholstery.
Please, contact me if you need more information.
Thank you,